Linux
Introduction awk is a powerful text processing tool for pattern scanning and processing. It's particularly useful for manipulating structured data and generating reports. Basic Structure pattern { action } * Works on input line by line * If pattern matches, execute action * Both pattern and action are optional Common Use Cases 1.
Linux
1. In-place File Editing Edit file directly with backup sed -i.bak 's/foo/bar/g' file.txt Edit without backup (dangerous!) sed -i '' 's/foo/bar/g' file.txt 2. Advanced Regular Expressions Swap first and last characters echo "hello" | sed
Linux
Basic Syntax sed [OPTIONS] 'COMMAND' file.txt 1. Substitution (s command) Replace first occurrence per line: sed 's/apple/orange/' fruits.txt Replace all occurrences (global): sed 's/apple/orange/g' fruits.txt Case-insensitive replacement: sed 's/apple/orange/gi' fruits.txt
Linux
Introduction sed (Stream EDitor) is a powerful text processing tool for: * Parsing and transforming text * Performing substitutions * Filtering content * Non-interactive text editing Basic Syntax sed [options] 'script' inputfile Common Options * -i: Edit files in-place (dangerous but useful) * -E: Use extended regular expressions * -n: Suppress automatic printing * -e: Add
Linux
Basic File Viewing head - View beginning of files head file.txt # Show first 10 lines head -n 5 file.txt # Show first 5 lines head -c 20 file.txt # Show first 20 bytes tail - View end of files tail file.txt # Show last 10 lines tail -n 15
Unclassified
Core Principle Always implement authentication/authorization in the backend. Frontend handling alone is insecure and insufficient. Key Responsibilities Backend (Must-Have) * Credential validation * Token generation (JWT/OAuth) * Session management * Password hashing * Rate limiting * Permission checks * Secure cookie management Frontend (Support Role) * Token storage (httpOnly cookies > localStorage) * Auth state management * Login/
Unclassified
Here are several ways to optimize Rclone's performance: 1. Use --transfers flag rclone copy --transfers 32 source:path dest:path This increases the number of concurrent file transfers (default is 4). Try values between 16-32 for better performance. 2. Enable multi-thread downloads/uploads rclone copy --multi-thread-streams 4 source:
Unclassified
Ripgrep (rg) is a line-oriented search tool that recursively searches your current directory for a regex pattern. It's designed to be fast, user-friendly, and respectful of your .gitignore rules by default. Installation On macOS brew install ripgrep On Ubuntu/Debian sudo apt-get install ripgrep On Windows # Using Chocolatey
Unclassified
Source maps (.map files) are files that create a mapping between your minified/compiled code and your original source code. They're extremely useful for debugging because they allow you to: 1. Debug your original source code even when running the minified version 2. See the exact line numbers
Unclassified
Key Considerations Pros * Provides additional recovery point options * Protects against backup file corruption * Minimal storage overhead due to CoW * Fast snapshot creation/deletion Cons * Additional complexity in backup chain * Increased storage usage over time * Potential performance impact during heavy snapshot operations Recommendations File History (Windows) ⚠️ Conditional/Not Recommended * File History
Unclassified
Core Similarity * Both provide virtual memory expansion using disk space * Handle memory overcommit situations * Enable hibernation support Key Differences Aspect Windows Pagefile Linux Swapfile Implementation Pages (4KB chunks) Entire process memory File Type Hidden system file Regular file or partition Compression No (except UWP via swapfile) Yes (zswap/zram optional)
Unclassified
1. Transform Rules * Most powerful and flexible * Processes requests at the edge (before reaching origin) * Can modify request/response headers, URL components, and HTTP headers * Lowest latency since changes happen at edge * Limited to Enterprise plans * Best for: Complex transformations and request modifications 2. URL Rewrite Rules (Configuration Rules) * Changes